in the mackenzie delta coastal region from pre … · egu2020-11944...
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FROM PRE-FRESHET TO PRE-FREEZEA FIELD SURVEY OF THE FATE OF ORGANIC MATTER REMOBILIZED FROM THE THAWING PERMAFROST
IN THE MACKENZIE DELTA COASTAL REGION
EGU Sharing Geoscience OnlineMay 2020
Session BG4.3Mobilization of permafrost material to aquatic systems and its biogeochemical fate
EGU2020-11944 [email protected]
THIS SCIENTIFIC PROJECT IS PART OF NUNATARYUK
D. O. J. Anikina, Marcel Babin, G. Bécu, S. Bélanger, M. Béguin, T. Bossé-Demers, G. Chaillou, R.-M. Couture, E. Devred, M. Dillon, D. Doxaran, R. Ettagiak, J. Ferland, M.-H. Forget, T. Gordon, S. Gruben Jr., C. Guilmette, A. Hilborn, Bennet Juhls, A. Laberge-Carignan, H. Lantuit, É. Leymarie, Martine Lizotte, Atsushi Matsuoka, J. Maury, L. Oziel, J. Sansoulet, L. Tisserand, D. Whalen
Marcel Babin / Project Leader / [email protected]
Bennet Juhls / [email protected]
Martine Lizotte / [email protected]
Atsushi Matsuoka / [email protected]
WHO?
EGU2020-11944 [email protected]
Thawing of permafrost in the Mackenzie Delta Region of Northern Canada, coupled with an increase in river discharge, prompts the release of particulate and dissolved organic matter from the largest Arctic drainage basin in North America into the Arctic Ocean. The fate of the newly-mobilized organic matter as it transits from the watershed through the delta and into the marine system remains poorly understood. (Nunataryuk - WP4)
CONTEXT
WHY?
EGU2020-11944 [email protected]
Figure from Fritz et al., 2017; adapted by J. Sansoulet et al.
Winter
Summer
OVERARCHING OBJECTIVE
Determine the seasonality and the fate of organic matter (OM) released in coastal waters of the Mackenzie Delta Region following permafrost thaw.
While past model results show general agreement with satellite estimates for dissolved organic carbon (DOC), a significant discrepancy appears particularly in the delta. Field campaigns are needed to address this knowledge gap.
GROUND TRUTHING AS A FIRST STEP
EGU2020-11944 [email protected]
TOWARDS REMOTE SENSING ASSESSMENTS AND BIOGEOCHEMICAL MODELLING
June 2019
Juhls et al., in prep.
July-August 2019
September 2019
MACKENZIE DELTA, INUVIALUIT SETTLEMENT REGION (ISR), CANADA
WINTER / SPRING / SUMMER / FALL (SEASONAL SURVEY - 2019)
June 2019
July-August 2019
September 2019
April 2019
WHERE AND WHEN?
EGU2020-11944 [email protected]
September 2019
HOW?
EGU2020-11944 [email protected]
Photo credits. S. Antonova, G. Bécu, J. Ferland, C. Gould, B. Juhls, E. Leymarie, M. Lizotte, A. Matsuoka, L. Oziel. EGU2020-11944 [email protected]
VARIOUS SAMPLING PLATFORMS AND LOCAL PARTNERSHIPS
June 2019
September 2019
July-August 2019WHAT?
VARIABLES MEASURED
REMOTE SENSING
EGU2020-11944 [email protected]
Vertical profiles of in situ hydrological parameters (temperature, conductivity (salinity), inherent optical properties (particle size distribution, particle backscattering coefficients, fluorescence of Chl a and of CDOM, vertical profiles of radiometric quantities (upwelling radiance, downwelling irradiance, surface irradiance). Absorption by colored dissolved organic matter (aCDOM), particulate absorption (ap), chlorophyll a (Chl a), nutrients, HPLC-pigments, DOC, DIC, FDOM, major cations and anions, 14C-POC, 13C-POC, 15N-PON, DNA-RNA, 14C-DOC, 14C-DIC, BA, δ18O/δD, SPM-TPC, biomarkers, lignins.
Measured in situ optical data will be used to calibrate algorithms for the retrieval of biogeochemical parameters from space with application to turbid coastal waters.
Remote Sensing provides synoptical context to in situ observations that are limited to short periods.
June 2019
September 2019
July-August 2019
EGU2020-11944 [email protected]
1-Survey on trends in DOC and POC fluxes over the period 1998-present (available/confidential to EC).
2-Report on quantification of recent modifications in OM processes in the Arctic Ocean (ongoing).
3-Assessment of the impact of modifications in organic carbon processes on the global CO2 flux (coming up).
IN THE WORKS
Satellite composites of coloured dissolved organic matter and
non-algal particulates (adg)
July-August 2019
September 2019
PRELIMINARY
EGU2020-11944 [email protected]
Juhls et al., in prep.
MODIS True Color image (single day within sampling period)
June 2019 July-August 2019 September 2019
